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1998 Chemistry
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(1) sol (2) emulsion (3) gel (4) foam |
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| 2. | Only an aldehyde having ....... can undergo the aldol condensation. |
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(1) at least one alpha H atom (2) at least one beta H atom (3) no alpha H atom (4) an aromatic ring |
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| 3. | Treatment of benzoic acid with CI2/FeCI3 will give ..... acid |
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(1) 0-chlorobenzoic (2) p-chlorobenzoic (3) m-chlorobenzoic (4) 2,4- dichlorobenzoic |
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| 4. | Ribose is an example of a/an: |
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(1) aldopentose (2) ketohexose (3) aldohexose (4) disaccharide |
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| 5. | The colour of the flame in borron trifluoride test is: |
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(1) blue (2) crimson (3) golden yellow (4) green |
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| 6. | The acid which reduces Fehling's solution is |
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(1) ethanoic acid (2) methanoic acid (3) propanoic acid (4) butanoic acid |
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| 7. | When 0.5 g of sulphur is burnt to SO2 4.6 kJ of heart is liberated. What is the enthalpy of formation of sulphate dioxide ? (S = 32 and O = 16) |
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(1) -147.2 kJ (2) +147.2 kJ (3) +294.4 kJ (4) -294.4 kJ |
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| 8. | Assuming complete ionisation, the pH of 0.1 M HCI is 1. The molarity of H2SO4 with the same pH is: |
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(1) 0.1 (2) 0.2 (3) 0.05 (4) 2.0 |
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| 9. | The double helical structure of DNA was proposed by: |
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(1) Meicher (2) Watson and Crick (3) Khorana (4) Emil Fischer |
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| 10. | Oxygen contains 90% O16 and 10% O18. Its atomic mass is: |
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(1) 16.2 (2) 17.4 (3) 17 (4) 16.5 |
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| 11. | The half-life period t1/2 of a radioactive element is N years. The period of its complete decay is: |
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(1) 2 N years (2) N2 years (3) infinity (4) 1/2 N2 years |
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| 12. | Iron pipes lying under acidic soil often attached to blocks of magnesium for protection from rusting. Magnesium offers protection to iron against corrosion because it: |
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(1) is lighter than iron (2) is more readily converted into positive ions (3) prevents air from reaching the surface of iron (4) forms a corrosion resistant alloy with iron. |
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| 13. | An aqueous solution containing 100 grams of dissolved a MgSO4 is fed to a crystalliser where 80% of the dissolved salt crystallises out as MgSO4.6H2O crystals. How many grams of the hexahydrate salt crystals are obtained from the crystalliser ? (Given Mg = 24: S =32;O =16 and H = 1) |
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(1) 80 (2) (3) 120 (4) 100 |
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| 14. | The most efficient agent for the absorption of SO3 is: |
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(1) 80% H2SO4 (2) 98% H2SO4 (3) 90% H2SO4 (4) 20% oleum |
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| 15. | During the electrolysis of fused sodium chloride, the anodic reaction is: |
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(1) Oxidation of sodium ions (2) reduction of sodium ions (3) Oxidation of chloride ions (4) reduction of chloride ions |
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| 16. | Which of the following is used for inducing sleep ? |
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(1) chloroquine (2) paracetamol (2) barbituric acid derivatives (4) bithional |
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| 17. | The colour of the precipitate produced by adding NaOH solution to HgCI2 is |
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(1) black (2) yellow (3) white (4) brown |
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| 18. | Which of the following is used as a catalyst for preparing Grignard reagent? |
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(1) Iodine powder (2) iron powder (3) manganese dioxide (4) activated charcoal |
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| 19. | Acetone and acetophenone can be distinguished by |
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(1)
Tollens test (2) DNP test (3) Schiff's reagent (4) Saturated solution of NaHSO3 |
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| 20. | When chlorine reacts with ethyl alcohol, it forms: |
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(1) chloroform (2) chloral (3) ethyl chloride (4) carbon tetrachloride |
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| 21. | The edge length of the unit cell of NaCI crystal lattice is 552 pm. If the ionic radius of sodium ion is 95 pm. what is the ionic radius of chloride ion? |
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(1) 368 pm (2) 190 pm (3) 276 pm (4) 181 pm |
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| 22. | A reagent used to test the presence of Fe+2 ion is: |
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(1) NH4CNS (2) H2S (3) K3Fe(CN)6 (4) K4Fe(CN)6 |
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| 23. | Which of the following is a wrong statement about cast iron? |
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(1) it contains about 4.5 % carbon (2) it is also called pig iron (3) it contains on cooling (4) it is corrosion resistant |
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| 24. | What is the product formed in the
following reaction? (1) NaOH C6H5OH + CCI4 ® (2) H+ |
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(1) o-hydroxybenzoic acid (2) p-hydroxybenzoic acid (3) salicylaldehyde (4) benzaldehyde |
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| 25. | Amines behave as: |
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(1) Lewis acids (2) Lewis bases (3) Amphoteric compounds (4) Neutral compounds |
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| 26. | The long form of the periodic table has...... periods, and ...... vertical columns. |
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(1) 6;8 (2) 6;18 (3) 8; 12 (4) 7; 18 |
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| 27. | In the Fischer-Tropsch synthesis of petrol, ...... and..... are used as the raw materials. |
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(1) CH4;H2 (2) H2;CO (3) CH3OH;CO (4) CH4;CH3OH |
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| 28. | Conversion of CH4 to CH3CI is an example of ...... reaction. |
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(1) nucleophilic substitution (2) electrophilic substitution (3) free radical addition (4) free radical substitution |
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| 29. | In benzene, all the six C-C bonds have the same length because of: |
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(1) isomerism (2) chain isomerism (3) resonance (4) hybridisation |
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| 30. | The element used by Rutherford in his famous scattering experiment was: |
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(1) tin (2) gold (3) lead (4) silver |
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| 31. | In blast furnace. the highest temperature is in: |
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(1) slag zone (2) reduction zone (3) combustion zone (4) fusion zone |
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| 32. | Silica is added to roasted copper ore during smelting in order to remove: |
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(1) cuprous oxide (2) cuprous sulphide (3) ferrous sulphide (4) ferrous oxide |
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| 33. | Which of the following is an antidiabetic drug? |
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(1) Penicillin (2) Insulin (3) aspirin (4) chloroquine |
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| 34. | Dimethyl terephthalate and ethylene glycol react to form: |
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(1) nylon-66 (2) nylon-6 (3) neoprene (4) dacron |
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| 35. | The internal energy of a substance: |
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(1) decreases with increase in
temperature (2) increases with increase in temperature (3) remains unaffected with change in temperature (4) can be calculated by the relation E = mc2 |
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| 36. | Which hydrocarbon is formed by the action of sodium on ethyl bromide? |
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(1) methane (2) ethane (3) butane (4) isobutane |
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| 37. | Acetone and acetaldehyde are: |
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(1) functioned isomers (2) Position isomers (3) chain isomers (4) not isomers |
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| 38. | What is the volume of 0.1 N HCI required to react completely with 1.0 g of pure calcium carbonate? (Ca = 40,C = 12 and O = 16) |
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(1) 250 cm3 (2) 150 cm3 (3) 100 cm3 (4) 200 cm3 |
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| 39. | Liebermann's test is answered by: |
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(1) methylamine (2) aniline (3) phenol (4) ethyl benzoate |
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| 40. | Which of the following compounds does not undergo nucleophilic substitution reactions ? |
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(1) ethyl bromide (2) vinyl chloride (3) isopropyl chloride (4) benzyl chloride |
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| 41. | If a mixture containing 3 moles of hydrogen and 1 mole of nitrogen is converted completely into ammonia, the ratio of initial and final volumes at the same temperature and pressure would be: |
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(1) 1 : 2 (2) 2 : 1 (3) 1 : 3 (4) 3 : 1 |
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| 42. | Man dies in an atmosphere of carbon monoxide because: |
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(1) it combines with oxygen present
in the body to form carbon dioxide (2) it increases the blood pressure (3) it reduces the organic matter of tissues (4) it combines with the haemoglobin of the blood making it incapable of absorbing oxygen |
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| 43. | India conducted an underground nuclear test at: |
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(1) Narora (2) Tarapur (3) Pushkar (4) Pokhran |
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| 44. | Which of the following enzymes is not useful in the digestion of proteins? |
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(1) pepsin (2) chymotrypsin (3) lipase (4) trypsin |
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| 45. | p-type silicon is formed by adding a minute amount of am element with: |
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(1) three valence electrons
(2) five valance electron (3) four valance electrons (4) six valance electron |
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| 46. | Benzene is unreactive because: |
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(1) it has carbon-carbon single bonds (2) it has double bonds (3) p electrons are delocalised (4) carbons are sp2 hybridised |
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| 47. | What is the monomer of polypeptide? |
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(1) glucose (2) amino acid (3) nucleotide (4) nucleoside |
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| 48. | For the reaction A ® B, the rate increase by a factor of 2.25 when the concentration of A is increased by 1.5. What is the order of the reaction? |
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(1) 0 (2) 3 (3) 1 (4) 2 |
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| 49. | Which of the following compounds is used in antiknock compositions to prevent the deposition of oxides of lead on spark plug, combustion chamber and exhaust pipe? |
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(1) glycol (2) glycerol (3) benzene (4) 1,2-dibromoethane |
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| 50. | The rate constant of a reaction depends on : |
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(1) the temperature of the system (2) the time of reaction (3) the extent of reaction (4) the initial concentration of the reactants |
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| 51. | A segment of DNA molecule, which codes or specific for one polypeptide chain is called...... |
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(1) adenine (2) phosphate group (3) amino acid (4) gene |
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| 52. | Vanaspathi is prepared by the....... of vegetable oils. |
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(1) oxidation (2) hydrogenation (3) distillation (4) dehydrogenation |
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| 53. | Which one of the following is an extensive property? |
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(1) molarity (2) molar volume (3) mole fraction (4) number of moles |
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| 54. | Which of the following is an linear polymer? |
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(1) glycogen (2) amylopectin (3) amylose (4) starch |
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| 55. |
When sodium benzenesulphonate is fused with NaOH, followed by acidification with HCI, the product formed is: |
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(1) benzenesulphonic acid (2) sodium phenate (3) phenol (4) chlorobenzene |
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| 56. | When the temperature of an ideal gas it increased from 270C to 9270C, the kinetic energy will be: |
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(1) same (2) eight times (3) four times (4) twice |
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| 57. | Gibbs free energy G is defined as: |
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(1) G = H - TS (2) G = H + TS (3) G = E + TS (4) G = E - TS |
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| 58. | The change in entropy of an ideal gas during a reversible isothermal expansion is: |
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(1) negative (2) Positive (3) zero (4) infinity |
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| 59. | The organic compound is found to contain C = 54,5%, O = 36.4% and H = 9.1 % by ,mass. Its empirical formula is: |
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(1) CH2O (2) CHO2 (3) C2H4O (4) C3H4O |
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| 60. | For the reaction sunlight H2 +CI2 ® 2HCl taking place on water, the order of reaction is: |
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(1) 2 (2) 1 (3) 0 (4) 3 |
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